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yinlixiao

现在完成时的用法在OG上说得很清楚，有两种用法：1 在过去某一不确定时间发生的动作；2 开始在过去一直持续到现在的动作。
为什么大家都一直在强调第2个用法，而忽略了第一种用法。

richardxia

以下是引用yinlixiao在2008-8-28 7:23:00的发言：
现在完成时的用法在OG上说得很清楚，有两种用法：1 在过去某一不确定时间发生的动作；2 开始在过去一直持续到现在的动作。
为什么大家都一直在强调第2个用法，而忽略了第一种用法。

so, which one should be the answer?

lupisces

I am lost ...

maybe just cannot use two perfect tense together in an inf?

liu032041

个人的意见：

这句话的意思是几乎没有人被知道吃过以后不要再吃的，这里第一个完成时态是指到目前为止没有这样的特例，所以是完成时态。而吃过以后不要再吃不是一个持续的动作，而是一个一次性的动作，不可能一直在吃，所以A不对。所以应该用不定式。冒号后面应该要跟的是一个完整的句子，所以B，E不对，C改变了句子的意思变成了没有什么人尝试过。

lijiahui0422

我觉得A完成时合理，因为 taste 发生在require 这个动作之前，用完成时可以很好的表示出这种先后关系，这种例子改错里涉及完成时的好像也不在少数，请各位拍砖！

sudagrape

个人觉得这句话要表达意思是：还没有人被知道在第一次吃过之后不会在要更多。是一个一般的状态，用to taste 即可，而且 taste 似乎不是一个可以持续的动作。 

A的意思是  还没有人被知道在第一次已经吃过之后而不会要更多，意思比较别扭

个人感觉还是D比较好。 陋见陋见

ruochen

谢谢蓝色泡泡，但是偶觉得这里似乎应该用完成式更好，因为完成式强调了不定式的动作发生在主句动作之前。看下面摘自语法大全：
1) 现在时：一般现在时表示的动词，有时与谓语动词表示的动作同时发生，有时发生在谓语动词的动作之后。
　　He seems to know this.
　　I hope to see you again. = I hope that I'll see you again.　我希望再见到你。

2) 完成时：表示的动作发生在谓语动词表示的动作之前。
　I'm sorry to have given you so much trouble.
　He seems to have caught a cold.

-- by 会员 LES (2004/6/4 19:21:00)

我觉得后面用了完成时的两个句子可不可以这样理解：

I'm sorry to have given you so much trouble.

He seems to have(=has) caught a cold.

去掉了黑体字之后句子的逻辑依然成立，

但是few people have been known to have tasted it for the first time就很奇怪了。

1.         The fear of rabies is well founded; few people are known to recover from the disease after the appearance of the clinical symptoms.

(A) few people are known to recover from the disease after the appearance of the clinical symptoms

(B) few people are known to have recovered from the disease once the clinical symptoms have appeared

(C) there are few known people who have recovered from the disease once the clinical symptoms have appeared

(D) after the clinical symptoms appear, there are few known people who have recovered from the disease（B）

(E) recovery from the disease is known for only a few people after the clinical symptoms appear这个答案可是B哦，怎么解释？？？？？

 

-- by 会员 ethyl (2005/5/7 14:46:00)

同理

few people are known to have recovered from the disease once the clinical symptoms have appeared

也是成立的